Renishaw ATOM Installation Manual page 27

Troubleshooting
(continued)
Fault
LED on the readhead appears white with
flashes of other colours as the readhead is
moved along the axis
LED on the readhead is double flashing
Blue even after moving it past the
reference mark several times
No reference mark output
Reference mark is not repeatable
LED on the readhead is flashing Red or
Blank over the reference mark
Multiple reference marks output
ATOM
linear installation guide
Cause
AGC is switched on and
the signal level is <70%
The readhead is not seeing a
reference mark
Only the chosen reference mark that has
been used in the calibration sequence is
repeatable, other reference marks may
not be phased
The reference mark is not phased
Unused reference marks have not
been deselected or FPC is damaged
Possible solutions
u Check the readhead optical window and scale are clean and free from contamination
u Restore factory defaults (see page 22) then check the LED is Green along the full axis and recalibrate
the system (see page 22). If it is not Green check the alignment of the readhead
Ensure you are moving the readhead past your chosen reference mark several times
u
Check the scale/readhead orientation
u
Check the scale readhead alignment
u
Check the readhead optical window and scale are clean and free from contamination
u
Check that the readhead variant is the correct type for the chosen scale
u
(see the data sheet for details of readhead configuration)
u Ensure you are not over-speeding the readhead during calibration mode (maximum speed <100 mm/sec)
u Calibrate the system (see page 22)
– If the system completes calibration mode then it has successfully seen and calibrated the reference mark
If you still don't see a reference mark then check the system wiring
– If the system does not calibrate the reference mark (LED on the readhead double flashes Blue)
see above for possible solutions
Ensure you are using the reference mark that has been calibrated for referencing your system
u
The readhead bracket must be stable and not allow any mechanical movement of the readhead
u
Check any unused reference marks have been deselected
u
Clean the scale and readhead optical window and check for damage then recalibrate the system over
u
the chosen reference mark
Ensure you are using the reference mark that has been calibrated for referencing your system as only this
u
reference mark will be guaranteed to remain phased.
The LED may flash Blank or Red when passing other reference marks if they have not been deselected
(see page 8)
Clean the scale and readhead optical window and check for scratches then recalibrate the system over the
u
chosen reference mark (see page 22)
All unused reference marks should be deselected (see page 8) as only the calibrated reference mark will be repeatable
u
Check alignment of deselection stickers
u
Replace damaged FPC (if applicable)
u
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